1// Copyright 2021 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_EXECUTION_RISCV64_FRAME_CONSTANTS_RISCV64_H_
6#define V8_EXECUTION_RISCV64_FRAME_CONSTANTS_RISCV64_H_
7
8#include "src/base/bits.h"
9#include "src/base/macros.h"
10#include "src/execution/frame-constants.h"
11#include "src/wasm/baseline/liftoff-assembler-defs.h"
12#include "src/wasm/wasm-linkage.h"
13
14namespace v8 {
15namespace internal {
16
17class EntryFrameConstants : public AllStatic {
18 public:
19  // This is the offset to where JSEntry pushes the current value of
20  // Isolate::c_entry_fp onto the stack.
21  static constexpr int kCallerFPOffset = -3 * kSystemPointerSize;
22};
23
24class WasmCompileLazyFrameConstants : public TypedFrameConstants {
25 public:
26  static constexpr int kNumberOfSavedGpParamRegs =
27      arraysize(wasm::kGpParamRegisters);
28  static constexpr int kNumberOfSavedFpParamRegs =
29      arraysize(wasm::kFpParamRegisters);
30  static constexpr int kNumberOfSavedAllParamRegs =
31      kNumberOfSavedGpParamRegs + kNumberOfSavedFpParamRegs;
32
33  // FP-relative.
34  // See Generate_WasmCompileLazy in builtins-riscv64.cc.
35  // TODO(riscv): add rvv v reg save
36  static constexpr int kWasmInstanceOffset =
37      TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs);
38  static constexpr int kFixedFrameSizeFromFp =
39      TypedFrameConstants::kFixedFrameSizeFromFp +
40      kNumberOfSavedGpParamRegs * kSystemPointerSize +
41      kNumberOfSavedFpParamRegs * kDoubleSize;
42};
43
44// Frame constructed by the {WasmDebugBreak} builtin.
45// After pushing the frame type marker, the builtin pushes all Liftoff cache
46// registers (see liftoff-assembler-defs.h).
47class WasmDebugBreakFrameConstants : public TypedFrameConstants {
48 public:
49  static constexpr RegList kPushedGpRegs = wasm::kLiftoffAssemblerGpCacheRegs;
50
51  static constexpr DoubleRegList kPushedFpRegs =
52      wasm::kLiftoffAssemblerFpCacheRegs;
53
54  static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count();
55  static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count();
56
57  static constexpr int kLastPushedGpRegisterOffset =
58      -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize;
59  static constexpr int kLastPushedFpRegisterOffset =
60      kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kDoubleSize;
61
62  // Offsets are fp-relative.
63  static int GetPushedGpRegisterOffset(int reg_code) {
64    DCHECK_NE(0, kPushedGpRegs.bits() & (1 << reg_code));
65    uint32_t lower_regs =
66        kPushedGpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
67    return kLastPushedGpRegisterOffset +
68           base::bits::CountPopulation(lower_regs) * kSystemPointerSize;
69  }
70
71  static int GetPushedFpRegisterOffset(int reg_code) {
72    DCHECK_NE(0, kPushedFpRegs.bits() & (1 << reg_code));
73    uint32_t lower_regs =
74        kPushedFpRegs.bits() & ((uint32_t{1} << reg_code) - 1);
75    return kLastPushedFpRegisterOffset +
76           base::bits::CountPopulation(lower_regs) * kDoubleSize;
77  }
78};
79
80}  // namespace internal
81}  // namespace v8
82
83#endif  // V8_EXECUTION_RISCV64_FRAME_CONSTANTS_RISCV64_H_
84